Are you interested in discussing with us how to reduce the cost of charging pile control and operation and maintenance? In addition to the compression of raw material costs, is there a better cost reduction in design and system architecture?
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The rapid installation of the entire pile of charging piles has facilitated the popularization of electric vehicle owners and new energy vehicles. The fiery market has made the charging pile manufacturing and operation and maintenance costs accompany the increase of competition, which has attracted the attention of the pile enterprises. This section takes the DC pile as an example, and discusses the feasible cost reduction plan from the point of electronic control.
The electronic control can be simplified into two parts: the main control board + human-computer interaction display; further subdivision, there are two mainstream schemes shown in Figure 1 and Figure 2.
Figure 1 shows the main control scheme of the DC pile
Solution 1: Cortex-M3 main control + serial screen, simple application programming, low technical difficulty, can meet the basic needs of charging control and human-computer interaction.
With the development of mobile payment and Internet of Things and vehicle networking, the shortage of serial screen solutions has gradually become prominent, such as the flexible design of human-machine interface and the difficulty of mobile payment access. At the same time, Cortex-M3 runs the bare metal program and expands the wireless DTU through the serial port. The data transmission speed is slow and the cost is high.
Figure 2 shows the DC pile master control scheme II
Option 2: Linux master + TFT color screen. The solution retains the Cortex-M3 as the charge controller master (real-time requirements), and implements functions such as display, data management, network communication, and payment in a Linux system. The technical difficulty is slightly higher than the single Cortex-M3 solution (software code aspect), and the cost is the same as the Cortex-M3 (although the cost of Linux hardware is increased, the price of the TFT bare screen is lower than that of the serial screen).
As a multi-tasking general-purpose system, Linux supports more complete human-machine interface interaction and complex network communication protocols, and can directly extend 3G/4G docking back-end servers (reducing on-site construction difficulty and wiring complexity of Ethernet and other wired methods). Reduce the additional cost burden of the DTU approach.
However, the hardware cost and communication flow of each charging post brought by the 3G/4G application cannot be ignored!
How to control the wiring construction complexity of wired mode and effectively reduce the cost of wireless communication? At this point, we have demonstrated Ethernet, RS-485, CAN-Bus, carrier, 3G/4G, ZigBee, Wi with many pile companies. -Fi, Bluetooth and other programs, and finally choose and practice the Wi-Fi communication method, and fine tune the second option.
Figure 3 Scheme 3 WiFi communication
In the third scheme, the micro-adjustment is carried out on the basis of the second scheme, and the 3G/4G of other charging piles other than the main pile is replaced by Wi-Fi. In the field application of charging piles, there are often multiple “aggregation†in one area, and communication between piles is realized through Wi-Fi, and the aggregated data is uploaded and released by the main pile. Its advantages:
l Eliminate wired independent communication line wiring
l Wi-Fi hardware costs only about one-tenth of the cost of 4G
l Wi-Fi itself supports hotspot function (no router required), data exchange saves the cost of each independent 4G module traffic
l Signal crossing obstacle capability and transmission distance is better than ZigBee and Bluetooth
l Support data encryption, allowing users to directly access Wi-Fi networks
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